iOS设置屏幕常亮

OC

// 设置屏幕常亮，默认是NO

[UIApplicationsharedApplication].idleTimerDisabled =YES;

// 设置窗口亮度大小，范围是0.1 - 1.0

[UIScreenmainScreen] setBrightness:0.5];

swfit 

UIApplication.shared.idleTimerDisabled =true